Electric-circuit controller



March 5, 192$, L MCCARRON 1,704,300

ELECTRIC CIRCUIT CONTROLLER Filed April 28, 1926 )5 WW A 1 1 7 INVENTOR 06W 74, fitww BY '5 ATTORNEY UNITED STATES PATENT'OFFICE.

LEWIS IE. MCCABBON, OF S FLASHER CORPOBATIO CALIFORNI.

IEBRA MADRE, CALIFORNIA, ASSIGNOB TO ELECTRIC SIGN N, OF LOS ANGELES, CALIFORNIA, A, CORPORATION OF ELECTRIC-CIRCUIT CONTROLLER.

Application filed April 28, 1926. Serial No. 105,095.

My invention relates to mechanism for making and breaking electric circuits whereby an intermittent use of the electric current is provided and the object thereof'is to provide a simple an thatpurpose. The drawing cation is a diagramma d reliable mechanism for forming apart of this applitic representation 0 my improved mechanism.

Wire 1 is the positive is connected to a source Wlre 1 runs to and is conas battery A.

or feed wire and of electricity shown neeted to contact 2 which is carried by spring 3 that is carried by lever 4 but is insulated therefrom which is pivoted by pin 5 on a suitable support .or back plate 6 of insulating material.

engages contact 7 Contact 2 normally mounted on lever 8 which leveris also'pivotally mounted on plate 6 pin 5. A thermo-expansive wire 9 1s betweencontact 7 and the pin. Wire 9 runs and is connected to an adjusting screw 10 mounted in bearing 11 secured to plate 6. Block 11 is connected by wire 12 with the winding of magnet 13 from which winding leads the return wire 14. Wire 15 leads to the device to be suplied with an interrupted current and wire 16 is the return wire therefrom. \Vhen current is supplied to wire 1 it passes through contacts 2 and 7,'

lever 8, wire 9, screw 10,

block 11. wire 12, windings of coil 13 and wire 14 thereby energizing coil 13 which then draws the end of lever 4 which forms an armature away from is mounted on plate tacts 2 and 8 to ment than would not rockable. 9 and it expands.

stop 17. Stop 17 6, thereby causing conremain longer in engagebe the case if lever 1 were The current soon heats wire A spring 18 keeps wire 9 taut as it expands. As soon as the expansion of wire 9 permits spring 18' to draw contact 8 away from contact 2 the current is broken and wire 9 begins to cool and shorten and coil 13 is de-energized.

Spring 19 which is connected to lever 4 and to plate 6 draws lever 4 back to stop 17 thereby increasing the time of the separation of contacts 2 and 8.' The length of time that the current is oti or on can be regulated by screw 10 and stop 17. If desired, contact 2 could be. stationary.

By this cient mechanism is provided for controlling an lntermittent electric circuit in which there are no parts to wear out or to get out of order. 7

Having described my invention, I claim:

An electric circuit controller comprising a back plate of insulating material; a lever roekably mounted on said-plate; an upper lever rockably mounted on said plate intermediate its ends, one end of said lever forming an armature; contacts carried by said levers, said contacts being normallyin engagement; springs connected to said levers to normally cause the contacts to separate; an electro magnet mounted on said plate so positioned that the upper lever forms an armature therefor; a bearing on said plate electrically connected to said magnet; an adjusting screw in said bearing; a thermoexpansive wire connected to said screw and to said lower lever; and an adjustable stop on said plate adapted to regulate the movement of said armature.

In witness that I claim the foregoing I have hereunto subscribed my name this 16th day of April, 1926.

,ILE IS r1. MoOARRON.

construction a simple and efli- 

